MOS transistor output circuit

U.S. Patent Number: 5192879

Abstract: An MOS transistor output circuit includes a parallel combination of first and second circuits including transistors of different output characteristics in either or both of paths between an output terminal and a point of ground potential and the output terminal and a V.sub.DD voltage supply terminal. Upon transition of an input signal level, both first and second circuit become conductive so that the output circuit exhibits a large current driving capability which permits the output voltage to rapidly change until it approaches a predetermined level. When the output voltage reaches the predetermined level, one of the first and second circuits is turned off to thereby prevent the output circuit ON-resistance R.sub.ON from becoming excessively small, which, in turn, limits the circuit driving capability, whereby ringing in the output voltage is effectively prevented.

Inventors: Aoki; Kazuo (Itami, JP), Shichinohe; Daisuke (Itami, JP)

Assignee: Mitsubishi Denki Kabushiki Kaisha (Tokyo, JP)

Application Number: 07/765,577

Issued: 1993-03-09

Expired: 2005-03-09

Classes: 326/87 ; 326/114; 326/121; 326/27; 326/58

Field of search: 307/475,451,448,443

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